For those looking forward to PHP6 (a jump beyond the upcoming PHP 5.3) Fabien Potencier has pointed out a few things that will be coming out in this future release (based on these notes).

PHP 5.3 is just around the corner with a lot of great new features. However, even if I'm really excited about this new release, I won't make yet another PHP 5.3 feature list; I will rather look at the future of PHP. PHP core developers met at php|tek and discussed the future of PHP. And it is really great to see that they plan lots of wonderful features; let's set aside the Unicode stuff.